Question

question
select the correct answer.
how did ancient astronomers classify stars?
on the basis of their absolute magnitude
on the basis of their apparent magnitude
on the basis of brightness
on the basis of their distance from earth

Explanation:

Ancient astronomers classified stars based on their apparent magnitude. Apparent magnitude is a measure of how bright a star appears from Earth. Absolute magnitude is the brightness a star would have at a standard distance, which was not known in ancient times. While brightness is related to apparent magnitude, the specific term used historically was apparent magnitude. Distance from Earth was not a classification method used by ancient astronomers as they lacked the means to measure stellar distances accurately.

Answer:

on the basis of their apparent magnitude